3 * Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
4 * 2006 Edgard Lima <edgard.lima@indt.org.br>
6 * gstv4l2object.h: base class for V4L2 elements
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
24 #ifndef __GST_V4L2_OBJECT_H__
25 #define __GST_V4L2_OBJECT_H__
27 #include "ext/videodev2.h"
30 #include <gst/base/gstpushsrc.h>
32 #include <gst/video/video.h>
34 typedef struct _GstV4l2Object GstV4l2Object;
35 typedef struct _GstV4l2ObjectClassHelper GstV4l2ObjectClassHelper;
36 typedef struct _GstV4l2Xv GstV4l2Xv;
38 #include <gstv4l2bufferpool.h>
40 /* size of v4l2 buffer pool in streaming case */
41 #define GST_V4L2_MIN_BUFFERS 2
43 /* max frame width/height */
44 #define GST_V4L2_MAX_SIZE (1<<15) /* 2^15 == 32768 */
48 #define GST_TYPE_V4L2_IO_MODE (gst_v4l2_io_mode_get_type ())
49 GType gst_v4l2_io_mode_get_type (void);
51 #define GST_V4L2_OBJECT(obj) (GstV4l2Object *)(obj)
57 GST_V4L2_IO_USERPTR = 3,
58 GST_V4L2_IO_DMABUF = 4,
59 GST_V4L2_IO_DMABUF_IMPORT = 5
62 typedef gboolean (*GstV4l2GetInOutFunction) (GstV4l2Object * v4l2object, gint * input);
63 typedef gboolean (*GstV4l2SetInOutFunction) (GstV4l2Object * v4l2object, gint input);
64 typedef gboolean (*GstV4l2UpdateFpsFunction) (GstV4l2Object * v4l2object);
66 #define GST_V4L2_WIDTH(o) (GST_VIDEO_INFO_WIDTH (&(o)->info))
67 #define GST_V4L2_HEIGHT(o) (GST_VIDEO_INFO_HEIGHT (&(o)->info))
68 #define GST_V4L2_PIXELFORMAT(o) ((o)->fmtdesc->pixelformat)
69 #define GST_V4L2_FPS_N(o) (GST_VIDEO_INFO_FPS_N (&(o)->info))
70 #define GST_V4L2_FPS_D(o) (GST_VIDEO_INFO_FPS_D (&(o)->info))
72 /* simple check whether the device is open */
73 #define GST_V4L2_IS_OPEN(o) ((o)->video_fd > 0)
75 /* check whether the device is 'active' */
76 #define GST_V4L2_IS_ACTIVE(o) ((o)->active)
77 #define GST_V4L2_SET_ACTIVE(o) ((o)->active = TRUE)
78 #define GST_V4L2_SET_INACTIVE(o) ((o)->active = FALSE)
80 struct _GstV4l2Object {
83 enum v4l2_buf_type type; /* V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_BUF_TYPE_VIDEO_OUTPUT */
85 /* the video device */
88 /* the video-device's file descriptor */
95 /* the current format */
96 struct v4l2_fmtdesc *fmtdesc;
97 struct v4l2_format format;
99 GstVideoAlignment align;
102 gboolean need_video_meta;
103 gboolean has_alpha_component;
105 /* only used if the device supports MPLANE
106 * nb planes is meaning of v4l2 planes
107 * the gstreamer equivalent is gst_buffer_n_memory
111 /* We cache the frame duration if known */
112 GstClockTime duration;
114 /* if the MPLANE device support both contiguous and non contiguous
115 * it allows to select which one we want. But we prefered_non_contiguous
116 * non contiguous mode.
118 gboolean prefered_non_contiguous;
120 /* This will be set if supported in decide_allocation. It can be used to
121 * calculate the minimum latency of a m2m decoder. */
122 guint32 min_buffers_for_capture;
125 GstV4l2IOMode req_mode;
130 /* the video device's capabilities */
131 struct v4l2_capability vcap;
133 /* the video device's window properties */
134 struct v4l2_window vwin;
136 /* some more info about the current input's capabilities */
137 struct v4l2_input vinput;
140 GSList *formats; /* list of available capture formats */
141 GstCaps *probed_caps;
152 GstStructure *extra_controls;
153 gboolean keep_aspect;
161 GstV4l2GetInOutFunction get_in_out_func;
162 GstV4l2SetInOutFunction set_in_out_func;
163 GstV4l2UpdateFpsFunction update_fps_func;
166 /* Skips interlacing probes */
167 gboolean never_interlaced;
168 /* Allow to skip reading initial format through G_FMT. Some devices
169 * just fails if you don't call S_FMT first. (ex: M2M decoders) */
170 gboolean no_initial_format;
173 struct _GstV4l2ObjectClassHelper {
178 GType gst_v4l2_object_get_type (void);
180 #define V4L2_STD_OBJECT_PROPS \
191 PROP_OUTPUT_IO_MODE, \
192 PROP_CAPTURE_IO_MODE, \
193 PROP_EXTRA_CONTROLS, \
194 PROP_PIXEL_ASPECT_RATIO, \
195 PROP_FORCE_ASPECT_RATIO
198 GstV4l2Object* gst_v4l2_object_new (GstElement * element,
199 enum v4l2_buf_type type,
200 const char * default_device,
201 GstV4l2GetInOutFunction get_in_out_func,
202 GstV4l2SetInOutFunction set_in_out_func,
203 GstV4l2UpdateFpsFunction update_fps_func);
205 void gst_v4l2_object_destroy (GstV4l2Object * v4l2object);
209 void gst_v4l2_object_install_properties_helper (GObjectClass * gobject_class,
210 const char * default_device);
212 void gst_v4l2_object_install_m2m_properties_helper (GObjectClass * gobject_class);
214 gboolean gst_v4l2_object_set_property_helper (GstV4l2Object * v4l2object,
216 const GValue * value,
218 gboolean gst_v4l2_object_get_property_helper (GstV4l2Object *v4l2object,
219 guint prop_id, GValue * value,
222 gboolean gst_v4l2_object_open (GstV4l2Object *v4l2object);
223 gboolean gst_v4l2_object_open_shared (GstV4l2Object *v4l2object, GstV4l2Object *other);
224 gboolean gst_v4l2_object_close (GstV4l2Object *v4l2object);
228 const GList* gst_v4l2_probe_get_properties (GstPropertyProbe * probe);
230 void gst_v4l2_probe_probe_property (GstPropertyProbe * probe, guint prop_id,
231 const GParamSpec * pspec,
232 GList ** klass_devices);
233 gboolean gst_v4l2_probe_needs_probe (GstPropertyProbe * probe, guint prop_id,
234 const GParamSpec * pspec,
235 GList ** klass_devices);
236 GValueArray* gst_v4l2_probe_get_values (GstPropertyProbe * probe, guint prop_id,
237 const GParamSpec * pspec,
238 GList ** klass_devices);
241 GstCaps* gst_v4l2_object_get_all_caps (void);
243 GstCaps* gst_v4l2_object_get_raw_caps (void);
245 GstCaps* gst_v4l2_object_get_codec_caps (void);
247 gboolean gst_v4l2_object_set_format (GstV4l2Object * v4l2object, GstCaps * caps);
249 gboolean gst_v4l2_object_caps_equal (GstV4l2Object * v4l2object, GstCaps * caps);
251 gboolean gst_v4l2_object_unlock (GstV4l2Object * v4l2object);
252 gboolean gst_v4l2_object_unlock_stop (GstV4l2Object * v4l2object);
254 gboolean gst_v4l2_object_stop (GstV4l2Object * v4l2object);
256 GstCaps * gst_v4l2_object_get_caps (GstV4l2Object * v4l2object,
259 gboolean gst_v4l2_object_acquire_format (GstV4l2Object * v4l2object,
260 GstVideoInfo * info);
262 gboolean gst_v4l2_object_set_crop (GstV4l2Object * obj);
264 gboolean gst_v4l2_object_decide_allocation (GstV4l2Object * v4l2object,
267 gboolean gst_v4l2_object_propose_allocation (GstV4l2Object * obj,
270 GstStructure * gst_v4l2_object_v4l2fourcc_to_structure (guint32 fourcc);
273 #define GST_IMPLEMENT_V4L2_PROBE_METHODS(Type_Class, interface_as_function) \
276 interface_as_function ## _probe_probe_property (GstPropertyProbe * probe, \
278 const GParamSpec * pspec) \
280 Type_Class *this_class = (Type_Class*) G_OBJECT_GET_CLASS (probe); \
281 gst_v4l2_probe_probe_property (probe, prop_id, pspec, \
282 &this_class->v4l2_class_devices); \
286 interface_as_function ## _probe_needs_probe (GstPropertyProbe * probe, \
288 const GParamSpec * pspec) \
290 Type_Class *this_class = (Type_Class*) G_OBJECT_GET_CLASS (probe); \
291 return gst_v4l2_probe_needs_probe (probe, prop_id, pspec, \
292 &this_class->v4l2_class_devices); \
295 static GValueArray * \
296 interface_as_function ## _probe_get_values (GstPropertyProbe * probe, \
298 const GParamSpec * pspec) \
300 Type_Class *this_class = (Type_Class*) G_OBJECT_GET_CLASS (probe); \
301 return gst_v4l2_probe_get_values (probe, prop_id, pspec, \
302 &this_class->v4l2_class_devices); \
306 interface_as_function ## _property_probe_interface_init (GstPropertyProbeInterface * iface) \
308 iface->get_properties = gst_v4l2_probe_get_properties; \
309 iface->probe_property = interface_as_function ## _probe_probe_property; \
310 iface->needs_probe = interface_as_function ## _probe_needs_probe; \
311 iface->get_values = interface_as_function ## _probe_get_values; \
316 #endif /* __GST_V4L2_OBJECT_H__ */